This is a crystal filter breadboard.
The latest version of firmware from NanoVNA Dislord adds a very useful crystal parameter measurement function. Detailed usage reference video: https://www.bilibili.com/video/BV1KS4y1D77t/
With such a simple method of measuring crystal parameters, it is easy to select a suitable crystal for DIY and verification of crystal filters, which inspired this open source project.
For information about crystal parameters and crystal filters, please refer to the following documents.
https://www.arrl.org/files/file/QEX_Next_Issue/Nov-Dec_2009/QEX_Nov-Dec_09_Feature.pdf
Version Information:
20220320: V1.00 version, not proofed, not verified
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